Summary

This mode makes your E3D V6 dragon sized :o . It only takes about 15 minutes if you have the tools. Dragon hotend has M2.5 holes. I used M3, but you can use whatever you want. The diameter of a dragon hotend should be the same as an E3D V6. With this mod, overall hotend length should be only 0.5mm shorter than that of the dragon.

Or just buy this I guess https://aliexpi.com/U4Yq .

What you need (M3):
Hacksaw
Sandpaper
2,5mm drill bit
Straight flute M3 tap

What you need (M2,5):
Hacksaw
Sandpaper
2,05mm drill bit
Straight flute M2,5 tap